Door stop



FIG. 1 is an isometric view of a door stop showing my new design;

FIG. 2 is a side elevational view taken from the left of FIG. 1;

FIG. 3 is a top plan view thereof, the bottom being flat and unornamented;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a rear elevational view thereof. 

The ornamental design for a door stop, substantially as shown and described. 